Coupling low phosphorus fertilization with straw amendment highlights large crop productivity and reduced N2O emission in vegetable production

IF 4.8 2区农林科学 Q1 SOIL SCIENCE

Applied Soil Ecology Pub Date : 2024-09-10 DOI:10.1016/j.apsoil.2024.105635

Zheng Zhao , Shuhang Wu , Haitao Zhu , Deping Zhou , Changbin Chu , Qingfeng Wang , Sixin Xu , Shumei Cai , Deshan Zhang

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引用次数: 0

Abstract

The managements of reducing phosphorus (P) fertilization and/or straw application have been demonstrated to effectively enhance nutrient use efficiency by modulating root-microbe interactions. Given that microorganisms play a predominant role in N₂O production pathways, investigating microbial communities and root traits in soils subjected to diverse management practices involving low P fertilization and/or straw application would yield crucial insights for minimizing N₂O emissions. A series of field experiments with four successive Brassica chinensis were conducted under greenhouse condition to test crop productivity and N₂O emission with different P fertilizer and straw managements. Results indicated that the high P fertilization treatment (HP) led to the largest cumulative N₂O emission with 13.33 kg N₂O/ha across the all treatments. Compared with HP treatment, the low P fertilization treatment (LP) and no P fertilizer treatment (NP) significantly decreased the cumulative N₂O emission by 34.06 % and 29.71 %, respectively. Correlation analysis indicating that the reduction of N₂O emission was positively correlated with the ratio of (nirS + nirK)/Nitrobacter. The combination of low P fertilization with straw addition (LPS) stimulated the elongation of B. chinensis roots with large specific length, thereby increasing the uptake of P and N by crops compared with those in LP treatment. The LPS treatment alleviated the total N₂O emissions by 20.86 % compared with HP treatment, despite the fact that the inclusion of the straw addition enhanced the total N₂O emission in low P soil. The increasing of N₂O emissions from straw-amended soils was likely attributed to the abundant presence of soil bacteria and fungi, as well as highly enriched microorganisms harboring functional genes (nirS, nirK and nosZ) encoding for denitrification. Therefore, low P fertilization combined with straw addition is recommended for greenhouse vegetable fields due to its remarkable efficiency in enhancing crop nutrient acquisition and mitigating N₂O emissions.

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低磷施肥与秸秆还田相结合，凸显了蔬菜生产中作物的高产和 N2O 排放的减少

实践证明，减少磷（P）肥施用和/或秸秆施用的管理方法可通过调节根系与微生物之间的相互作用，有效提高养分利用效率。鉴于微生物在一氧化二氮的产生途径中起着主导作用，研究土壤中的微生物群落和根系性状，并对其进行低磷施肥和/或秸秆施用等不同的管理实践，将为最大限度地减少一氧化二氮的排放提供重要的启示。研究人员在温室条件下对四茬甘蓝进行了一系列田间试验，以检测不同磷肥和秸秆管理下的作物产量和一氧化二氮排放量。结果表明，在所有处理中，高磷肥处理（HP）的累积 N2O 排放量最大，为 13.33 千克 N2O/公顷。与高磷肥处理相比，低磷肥处理（LP）和无磷肥处理（NP）分别显著减少了 34.06% 和 29.71% 的累积 N2O 排放量。相关分析表明，N2O 排放量的减少与（nirS + nirK）/硝化细菌的比率呈正相关。与低磷肥处理相比，低磷肥与秸秆添加（LPS）的结合刺激了盐肤木根系的伸长，使其具有较大的比长，从而增加了作物对磷和氮的吸收。与 HP 处理相比，LPS 处理的 N2O 排放总量减少了 20.86%，尽管在低 P 值土壤中添加秸秆会增加 N2O 排放总量。秸秆改良土壤中 N2O 排放量增加的原因可能是土壤中存在大量细菌和真菌，以及大量富含编码反硝化功能基因（nirS、nirK 和 nosZ）的微生物。因此，由于低磷肥结合秸秆添加在提高作物养分吸收和减少 N2O 排放方面具有显著效果，建议在温室蔬菜田中使用。

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来源期刊

Applied Soil Ecology 农林科学-土壤科学

CiteScore

9.70

自引率

4.20%

发文量

363

审稿时长

5.3 months

期刊介绍： Applied Soil Ecology addresses the role of soil organisms and their interactions in relation to: sustainability and productivity, nutrient cycling and other soil processes, the maintenance of soil functions, the impact of human activities on soil ecosystems and bio(techno)logical control of soil-inhabiting pests, diseases and weeds.